Forming several hundred miles wast of the Philippines on October 18, the system became a tropical storm the next day and a typhoon by October 20. Ketsana became a powerful typhoon as it slowly recurved in Philippine Sea well to the south of Iwo Jima, with maximum sustained winds of 125 kts/145 mph.The cyclone became an extratropical storm with hurricane-force winds late on October 25. The storm turned northeast and weakened to gale-strength in the Bering Sea on October 28. [9] It was noted that surface chlorophyll-a concentration in the ocean increased 30-fold during the existence of this typhoon
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